Set the cam gears to 0 and lock them down.
Then rotate the crank until the motor is at tdc (top dead center white mark).
Then look at your cam timing. Make sure the cams markings are lining up etc.

Honestly, I don't even think you should be running aem cam gears.
Aem cam gears suck (old 3 bolt style). They are also useless unless you have a turbo application or aftermarket cam application on a ls motor etc.